二叠纪海平面变化研究
The global sea-level changes during the Permian
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摘要: 在研究全球不同地区二叠纪沉积、层序及生物资料基础上,通过全球诸大陆典型剖面层序划分和对比表明,二叠纪至少有6次海平面升降事件具全球对比意义。二叠纪全球海平面旋回曲线,在不同板块不同成因盆地,其形态及结构不同,但总体可分为两种类型或分支;一是以海相→陆相沉积序列为主的反映主体海平面下降的经典型或欧美型;二是以海相碳酸盐岩→碳酸盐-硅质岩沉积序列为特征的揭示主体海平面上升的特拉斯型或华南型。这与二叠纪特定的全球构造-古地理密切相关。Abstract: The authors in this paper suggest, based on the previous date of Permian sediments, sequences and biostratigraphy in conjunction with worldwide sequence division and correla-tion, that there are at least six eustatic sea level events during the Permian which can be traced or correlated all over the world, Generally speaking, the Permian parts of Phanero-zoic eustatic sea-level cycle curves include two patterns or branches:the one is the so-called classical or Euramerican type which represents the overall sea-level fall characteristic of marine-nonmarine regressive successions, the other is defined as the Tethyan or South Chi-na type which points to the overall sea-level rise characteristic of transgressive carbonate rock or carbonate-siliceous rock successions. The eustatic sea-level curves mentioned above are closely related to the global tectonic and palaeogeographic frameworks.
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Keywords:
- sea-level change /
- Permian /
- Euramerican type /
- South China type
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